* Predicate: The predicate is the part of the sentence that tells us what the subject does or is. In this case, the predicate is "appeared angry."
* Adjective: "Angry" describes the teacher, the subject of the sentence.
* Predicate Adjective: A predicate adjective modifies (describes) the subject and follows a linking verb (in this case, "appeared").
Therefore, "angry" is a predicate adjective because it modifies the subject "teacher" and follows the linking verb "appeared."